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Electrocardiogram (ECG)

Electrocardiogram (ECG)

Overview

An Electrocardiogram (ECG) is a simple, quick, and non-invasive test that records the electrical activity of the heart. Small adhesive electrodes are placed on the chest, arms, and legs to detect electrical signals produced by each heartbeat. These signals are displayed as wave patterns on a monitor or printout, helping doctors evaluate heart rhythm and identify abnormalities. An ECG is commonly used to detect irregular heartbeats (arrhythmias), heart attacks, enlarged heart chambers, and other cardiac conditions. The procedure typically takes only a few minutes, requires no special preparation in most cases, and plays a crucial role in early detection and monitoring of heart health.

Ideal For

An ECG is ideal for individuals experiencing symptoms such as chest pain, palpitations, shortness of breath, dizziness, fainting, or unexplained fatigue. It is recommended for patients with high blood pressure, diabetes, a family history of heart disease, or those at risk of cardiac conditions. An ECG is also commonly performed during routine health check-ups, before surgeries, to monitor existing heart conditions, and to assess heart function in emergency situations.

Pre-Requisite

Before undergoing an ECG, it is important to follow a few simple instructions to ensure accurate results:

No fasting is usually required unless advised by your doctor.

Wear comfortable clothing that allows easy access to the chest, arms, and legs.

Avoid applying lotions, oils, or creams on the chest area on the day of the test.

Inform the healthcare provider about any heart conditions, pacemakers, or ongoing medications.

Stay relaxed and avoid strenuous physical activity just before the test for accurate readings.

Process

An ECG is a quick and painless procedure performed by a trained technician. The patient is asked to lie down comfortably on an examination table. Small adhesive electrodes are attached to specific areas on the chest, arms, and legs. These electrodes are connected to an ECG machine, which records the electrical signals of the heart. The patient is required to remain still and breathe normally while the machine captures the readings. The entire procedure usually takes about 5–10 minutes, and the electrodes are removed immediately afterward. Patients can resume their normal activities right away.

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When and Why CT Scan is Prescribed?

An ECG is prescribed when a patient experiences symptoms that may indicate a heart-related issue, such as chest discomfort, irregular heartbeat, rapid pulse, shortness of breath, dizziness, or fainting spells. It is also recommended during routine health check-ups, before surgical procedures, or when monitoring known heart conditions. Doctors use an ECG to detect arrhythmias, signs of a previous or ongoing heart attack, heart enlargement, electrolyte imbalances, and other abnormalities in heart rhythm. It is a valuable first-line test for evaluating cardiac health and guiding further diagnostic or treatment decisions.

Things You Should Know

An ECG is a quick test that usually takes only 5–10 minutes.

It records the heart’s electrical activity and helps detect rhythm abnormalities.

The procedure is completely painless and non-invasive.

You will need to lie still during the recording for accurate results.

It does not use radiation and is safe for all age groups.

Inform your healthcare provider if you have a pacemaker or any implanted cardiac device.

The test may be repeated over time to monitor heart health or treatment progress.

Frequently Asked Questions

An ECG can identify irregular heart rhythms (arrhythmias), signs of a heart attack (past or present), heart enlargement, conduction abnormalities, and electrolyte imbalances affecting heart function.
Yes, stress, anxiety, caffeine, or recent physical activity can temporarily affect heart rate and rhythm. It is best to stay calm and relaxed before and during the test.
An ECG is often the first step in cardiac evaluation, but additional tests such as an echocardiogram, stress test, or blood tests may be required for a complete diagnosis.
Yes, an ECG can be safely performed. It also helps doctors check how well the pacemaker is functioning.
A normal ECG is reassuring, but it does not rule out all heart conditions. Your doctor may suggest further tests if symptoms persist.

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